# -*- coding: utf-8 -*-
# vim:et:sw=4:sts=4:ai:nosi
# Copyright (c) 2012 Flibusta Quotes Team
#
# This file is part of Flibusta Quotes.
#
# Flibusta Quotes is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from __future__ import unicode_literals

import webapp2
from google.appengine.api import users, memcache
from model import Quote, Comment
from util import datetime_to_float_str
from base import BaseHandler, NotFoundException
from comments import CommentsHandler

from config import COMMENTS_PAGESIZE


class DiscussHandler(BaseHandler):
    params = [
        ('qid', 'int'),
        ('before', 'datetime')]
    post_params = [
        ('qid', 'int'),
        ('content', 'unicode')]
    memcache_key = 'discuss'

    @BaseHandler.get_method
    def get(self, qid, before):
        """Discussion of the quote"""
        # Get the quote
        quote = Quote.get_by_id(qid)
        if not quote:
            raise NotFoundException('Цитата не найдена')

        # Fetch comments on the quote
        comments = Comment.fetch_comments_on_quote(
            quote.key(),
            before,
            COMMENTS_PAGESIZE + 1
        )

        # Prepare template context
        context = {
            'quote': quote,
            'comments': comments[:COMMENTS_PAGESIZE],
            'request': self.request
        }
        # If there are more than COMMENTS_PAGESIZE comments,
        #  we need to provide a link to the next page
        if len(comments) == COMMENTS_PAGESIZE + 1:
            before = comments[-1].submitted
            context['before'] = datetime_to_float_str(before)

        # Return template name and context to render
        return 'discuss.html', context

    @BaseHandler.post_method
    def post(self, qid, content):
        """Add a comment to the quote"""

        # If no contents, redirect
        if not content or content.strip() == '':
            return self.request.uri

        # Get the quote by ID, looking in the cache first
        quote = Quote.get_by_id(qid)
        if not quote:
            raise NotFoundException('Цитата не найдена')

        # Get current user
        user = users.get_current_user()

        # Put comment to the datastore
        comment = Comment(parent=quote.key())
        comment.content = content
        if user:
            comment.submitter = user
        comment.put()

        # Remove stale pages from the cache
        memcache.delete(self._get_key(qid=qid))
        memcache.delete(CommentsHandler._get_key())

        # Return redirect url
        return '/%d/discuss' % qid

